KR20220132877A - Evaluation method for impact of abnormal operation of pumps and valves - Google Patents

Abstract

The present invention relates to a method for evaluating an effect of an abnormal operation of a pump and a valve. The method includes the steps of: operating, by a control device, a pump to generate a hydraulic pressure in a pipe; measuring a flow rate in the pipe through a flow meter when the hydraulic pressure is generated by the pump; blocking, by the control device, a flow path by performing at least one operation of a pump sudden stop or a valve sudden stop when a constant flow rate is circulated; measuring a pressure in the pipe by a plurality of pressure gages provided at predetermined positions of the pipe; detecting an abnormality by performing at least one operation of a pump restart or a valve restart by the control device and confirming a pressure difference of the pump and leakage of the valve by a monitoring device, when a pressure measured by each of the pressure gages exceeds a maximum allowable pressure of a system; stopping, by the control device, at least one of operation of the pump and the valve when the abnormality is detected; and then counting the number of pump sudden stops or valve sudden closes; and deriving performance of the pump and the valve, an operation time, the number of operations, an operation possibility, an operation available time, and a system safety based on the number of pump sudden stops, the number of valve sudden closes, the pressure, and the flow rate. Therefore, it is possible to improve efficiency and reliability in safe operation management of a nuclear power plant system.

Description

EVALUATION METHOD FOR IMPACT OF ABNORMAL OPERATION OF PUMPS AND VALVES

The present invention relates to a method for evaluating the impact on abnormal operation of pumps and valves, and by measuring the number of times for sudden stop and valve closing of pumps due to abnormal operation of pumps and valves, the effect on repeated pump and valve operation stops technology for evaluating

Safety-related pumps and valves installed in nuclear power plants must exhibit their designed performance without any problems under any conditions. However, physical devices such as pumps and valves not only deteriorate as the number of times they are used increases, but also cause serious damage to pipes, supports, or system fluid storage tanks when abnormal operations are repeated.

In order to prevent such an abnormal situation from occurring in advance, a test is being carried out to evaluate the soundness of the system by applying the operating pressure and maximum receiving pressure of the pump and valve.

However, in the conventional test method, a calibration pressure gauge applied within the pressure range of the valve to be tested is installed in the pump, and the pump's pressure increase state, whether there is an abnormality in the pump, and the pressure maintenance state, etc., are required to be checked before every test start, and the test is performed accordingly. The disadvantage is that the time is delayed.

In addition, since the valves installed to secure the safety of the system have different sizes and capacities, separate test preparation time is required to configure the pressurized test line applied to the valve. there is difficulty in doing

In addition, since all preparations for the test are manually performed, the operator arbitrarily increases the pressure to the test pressure using a pump, thereby causing an inaccurate pressure rise state by manual operation.

In order to solve this problem, it is urgent to develop a technology that evaluates the effects of abnormal operation of pumps and valves on the system.

The present invention relates to abnormal operation of pumps and valves, which can evaluate the impact on abnormal operation of systems used in nuclear power plants by measuring the number of times for sudden stop and valve closing of pumps due to abnormal operation of pumps and valves. Impact assessment methods can be provided.

A method for evaluating the influence of a pump and a valve on abnormal operation according to an aspect of the present invention includes: a hydraulic pressure generating step in which a control device operates a pump to generate hydraulic pressure in a pipe; a flow rate measurement step of measuring the flow rate in the pipe through a flow meter when hydraulic pressure is generated by the pump; a flow path blocking step in which the control device performs at least one of a sudden stop of a pump or a sudden closing of a valve when a predetermined flow rate is circulated to block the flow path; a pressure measuring step in which at least one pressure measuring device provided at a predetermined position of the pipe measures the pressure in the pipe; When the pressure measured from each pressure gauge exceeds the maximum acceptable pressure of the system, the control device performs at least one of restarting the pump or opening the valve, and the monitoring device checks the differential pressure of the pump and the leakage of the valve. Abnormality detection step of detecting whether there is an abnormality; When abnormality is detected, the control device may include an emergency stop step of stopping driving of at least one of the pump and the valve.

Preferably, it may further include a counting step of counting the number of times of sudden stop or valve closing of the pump and transmitting it to the monitoring device.

Preferably, the number of times of sudden stop of the pump, number of times of sudden closing of the valve, pressure and flow rate of pump and valve performance, operating time, operating frequency, operability, operating time, and system safety are derived and displayed on the monitoring device It may include further steps.

Preferably, in the step of blocking the flow path, the sudden stop and restart of the pump and the sudden closing and opening of the valve may be repeated until the measured pressure exceeds the maximum acceptable pressure of the system.

Preferably, in the step of blocking the flow path, sudden stop and restart of the pump and sudden closing and opening of the valve may be repeated until the differential pressure of the pump is less than a predetermined level of the design differential pressure or a valve leakage is confirmed.

According to the present invention, efficiency and reliability can be improved in the safe operation management of a nuclear power plant system by measuring the number, pressure, and flow rate for sudden stop and valve closing of the pump due to abnormal operation of the pump and valve.

1 is a schematic diagram schematically illustrating an environment for evaluating an influence on abnormal operation of a pump and a valve according to an embodiment.
2 is a flowchart illustrating a procedure for evaluating an effect on an abnormal operation of a pump and a valve according to an exemplary embodiment.
3 is a flowchart illustrating in detail a procedure for evaluating the effect on the sudden stop of the pump according to the first embodiment.
Figure 4 is a flowchart showing in detail the procedure for evaluating the effect on the sudden closing of the valve according to the second embodiment.

Hereinafter, a method for evaluating the effect on abnormal operation of a pump and a valve according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

Objects and effects of the present invention can be naturally understood or made clearer by the following description, and the objects and effects of the present invention are not limited only by the following description. In addition, in the description of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a schematic diagram schematically illustrating an environment for evaluating an influence on abnormal operation of a pump and a valve according to an embodiment.

As shown in FIG. 1, the environment for evaluating the influence on the abnormal operation of the pump 200 and the valve 300 according to an embodiment is the control device 100, the pump 200, the valve 300, the flow meter ( 400 ), a pressure gauge 500 , a monitoring device 600 , and a cooler 700 .

The control device 100 communicates with the monitoring device 600 and can control the operation of the pump 200 and the opening and closing of the valve 300 .

The pump 200 may circulate the fluid by forming hydraulic pressure in the pipe, the valve 300 may be provided in the discharge part to open or block the fluid to circulate the main flow path, and the flow meter 400 may circulate the fluid through the pipe. The flow rate information may be measured and transmitted to the monitoring device 600 . A plurality of pressure gauges 500 are provided at predetermined locations in the pipe to transmit pressure information measured at each location to the monitoring device 600 , and the monitoring device 600 has a flow rate measured from the flow meter 400 . Information and pressure information measured from the pressure meter 500 may be received and displayed. The cooler 700 may cool heat generated from the circulating fluid.

2 is a flowchart illustrating a procedure for evaluating an influence on an abnormal operation of a pump and a valve according to an exemplary embodiment.

As shown in FIG. 2 , the order of evaluating the influence on the abnormal operation of the pump 200 and the valve 300 according to an embodiment is a hydraulic pressure generation step (S100), a flow rate measurement step (S200), and a flow path blocking step (S300). ), a pressure measurement step (S400), an abnormality detection step (S500), an emergency stop step (S600), and a counting step (S700).

In the hydraulic pressure generating step ( S100 ), the control device 100 may operate the pump 200 to generate hydraulic pressure in the pipe. At this time, the fluid circulates in the pipe due to the pump 200 , but depending on whether the valve 300 is opened or closed, the main flow path may be circulated and the recirculation flow path may be circulated.

In the flow measurement step ( S200 ), when hydraulic pressure is generated due to the pump 200 , the flow meter 400 may measure the flow rate in the pipe. In this case, the measured flow rate information may be transmitted to the monitoring device 600 .

In the flow path blocking step (S300), when a predetermined flow rate is circulated, the control device 100 may perform at least one of a sudden stop of the pump 200 or a sudden closing of the valve 300 to block the flow path. At this time, the flow path blocked due to the sudden closing of the valve 300 is the main flow path, and the fluid circulating in the pipe due to the blockage of the main flow path may be circulated as the recirculation flow path. In addition, the temperature and pressure of the fluid circulating through the recirculation passage may increase due to the absence of the cooler 700 .

In the pressure measurement step ( S400 ), at least one pressure gauge 500 at a predetermined position in the pipe may measure the pressure in the pipe. At this time, the measured pressure information in the pipe may be transmitted to the monitoring device (600). If the pressure information measured from each pressure meter 500 is less than the maximum acceptable pressure of the system, the control device 100 restarts the pump 200 and opens the valve 300, and circulates a certain amount of flow to the main flow path. After this, the flow path can be blocked by performing a sudden stop of the pump 200 and a sudden closing of the valve 300 again. That is, until the measured pressure exceeds the maximum accommodated pressure of the system, the pump 200 abruptly stops and restarts, and the valve 300 abruptly closes and opens may be repeated.

In the abnormal detection step (S500), when the pressure measured from each pressure meter 500 exceeds the maximum acceptable pressure of the system, the control device 100 restarts the pump 200 or opens the valve 300. At least one operation , and the monitoring device may detect an abnormality by checking the differential pressure of the pump and the leakage of the valve. At this time, if the differential pressure of the pump 200 shows a performance of 90% or less than the design differential pressure of the pump, it may be determined that an abnormal situation has occurred. In addition, when the leakage of the valve 300 is confirmed, it may be determined that an abnormal situation has occurred.

In the emergency stop step ( S600 ), when abnormality is detected, the control device 100 may stop driving of at least one of the pump 200 and the valve 300 . When the measured pressure exceeds the maximum acceptable pressure of the system, but no abnormality is detected, the control device 100 restarts the pump 200 and opens the valve 300 so that the fluid in the pipe can be circulated to the main flow path. And, until an abnormality is detected, sudden stop and restart of the pump 200 and sudden closing and opening of the valve 300 may be repeated.

The counting step (S700) may be transmitted to the monitoring device 600 by counting the number of times of sudden stop of the pump 200 or the sudden closing of the valve 300 . At this time, the number of times of sudden stop of the pump 200 and the sudden closing of the valve 300 may be the number of times before an abnormal situation occurs.

The display step (S900) is the number of sudden stops of the pump 200, the number of sudden closing of the valve 300, the measured pressure, the measured flow rate, the performance of the pump 200 and the valve 300, operation time, operation number, operation Possibility, operating time, and system safety may be derived and displayed on the monitoring device 600 .

The order of evaluating the influence on the above-described pump and valve abnormal operation shows the overall flow, and will be described in detail according to the embodiments of FIGS. 3 and 4 in more detail.

3 is a flowchart showing a sequence for a sudden stop of the pump according to the first embodiment.

As shown in FIG. 3 , the flow for the sudden stop of the pump 200 according to the first embodiment operates the pump 200 , the fluid circulates through the main flow path by opening the valve 300 , and a predetermined amount for a predetermined time After maintaining the circulation of the fluid, the pump 200 may be suddenly stopped. After a predetermined time, the pump 200 may be restarted, and the pressure in the pipe may be measured to determine whether the measured pressure exceeds the maximum accommodated pressure of the system. When the pressure in the pipe exceeds the maximum accommodated pressure of the system, it can be checked whether the differential pressure of the pump 200 exhibits performance of 90% or more of the design differential pressure after restarting the pump. When the differential pressure of the pump 200 is lowered to 90% or less of the design differential pressure, the operation of the pump 200 and the valve 300 is stopped. Here, when the pressure in the pipe is lower than the maximum accommodated pressure of the system, the circulation of the fluid is maintained, and the sudden stop and restart of the pump 200 are repeated. If the differential pressure of the pump 200 is not lowered to 90% or less of the design differential pressure, check the leakage of the valve 300, and when the leakage of the valve 300 occurs, the pump 200 and the valve 300 are operated to stop If the leakage of the valve 300 is not confirmed, the pump 200 is repeatedly stopped and restarted after maintaining the circulation of the fluid again. In the repeated process, the number of times the pump 200 is suddenly stopped may be counted, and the number of times that the pump 200 and the valve 300 have been stopped when the pump 200 and the valve 300 are stopped may be measured.

Figure 4 is a flowchart showing the sequence for the sudden closing of the valve according to the second embodiment.

As shown in Figure 4, the flow for the sudden closing of the valve 300 according to the second embodiment operates the pump 200, the opening of the valve 300, the fluid circulates in the main flow path, a predetermined time After maintaining the circulation of the fluid for a while, the valve 300 is rapidly closed. Due to the closing of the valve 300, the fluid circulates in the circulation passage. In the circulation passage, the temperature and pressure of the fluid increase due to the absence of the cooler 700 . At this time, after checking whether the pressure in the pipe exceeds the maximum acceptable pressure of the system, if the pressure in the pipe exceeds the maximum acceptable pressure of the system, check whether the differential pressure of the pump 200 shows 90% or more of the design differential pressure, and When the differential pressure of 200) is lowered to 90% or less of the design differential pressure, the operation of the pump 200 and the valve 300 is stopped. Here, when the maximum receiving pressure of the system is not exceeded, the valve 300 is opened to maintain the circulation of the fluid, and the sudden closing and opening of the valve 300 are repeated again. If the differential pressure of the pump 200 is 90% or more of the design differential pressure, check the leakage of the valve 300 , and when the leakage of the valve 300 occurs, the operation of the pump 200 and the valve 300 is stopped. If there is no abnormality in the valve 300 , the valve 300 is opened again to maintain the circulation of the fluid, and then the sudden stop and restart of the valve 300 are repeated. In the repeated process, the number of times the valve 300 is suddenly closed may be counted, and the number of times the valve 300 is abruptly closed when the pump 200 and the valve 300 are stopped may be measured.

Although the present invention has been described in detail through representative embodiments above, those of ordinary skill in the art will understand that various modifications are possible within the limits without departing from the scope of the present invention with respect to the above-described embodiments. will be. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by all changes or modifications measured from the claims and equivalent concepts as well as the claims to be described later.

100: control unit 200: pump
300: valve 400: flow meter
500: pressure gauge 600: monitoring device
700: cooler
210: main pump 230: auxiliary circulation pump
310: main valve 330: auxiliary circulation valve

Claims (5)

A hydraulic pressure generating step in which the control device operates the pump to generate hydraulic pressure in the pipe;
a flow rate measurement step of measuring the flow rate in the pipe through a flow meter when hydraulic pressure is generated by the pump;
a flow path blocking step in which the control device performs at least one of a sudden stop of a pump or a sudden closing of a valve when a predetermined flow rate is circulated to block the flow path;
a pressure measuring step in which at least one pressure measuring device provided at a predetermined position of the pipe measures the pressure in the pipe;
When the pressure measured from each pressure gauge exceeds the maximum acceptable pressure of the system, the control device performs at least one of restarting the pump or opening the valve, and the monitoring device checks the differential pressure of the pump and the leakage of the valve. Abnormality detection step of detecting whether there is an abnormality;
When an abnormality is detected, the method for evaluating the impact on the abnormal operation of the pump and the valve comprising an emergency stop step of stopping the operation of at least one of the pump and the valve by the control device.
According to claim 1,
Counting the number of times of sudden stop of the pump or sudden closing of the valve, the method further comprising a counting step of transmitting to the monitoring device. 3. The method of claim 2,
The display step of deriving the pump and valve performance, operating time, operating frequency, operability, operable time, and system safety based on the number of times of sudden stop of the pump, number of times of sudden closing of the valve, pressure and flow rate, and displaying on the monitoring device. A method for evaluating the impact on abnormal operation of pumps and valves.
According to claim 1,
The flow path blocking step is a method of evaluating the impact on abnormal operation of pumps and valves, characterized in that the sudden stop and restart of the pump and the sudden closing and opening of the valve are repeated until the measured pressure exceeds the maximum accommodating pressure of the system.
According to claim 1,
The flow path blocking step is an abnormal operation of a pump and valve, characterized in that the sudden stop and restart of the pump, and the sudden closing and opening of the valve are repeated until the differential pressure of the pump is below a certain level of the design differential pressure or the valve leakage is confirmed. for impact assessment methods.

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